Combined intake and exhaust manifold



' w, s. HARLEY.'

COMBINED INTAKE AND EXHAUST MANIFOLD.

` y A15-momma man mp1s. 191m 1.,328,150

Patented Jan. 13, 1920.

mman STATES PATENT ermee.,

. I ,/Z l Y i I WILLIAM S. HARLEY, F MILWAUKEE, WISCONSIN, ASSIGNOR TO ,HARLEY-:DAVIDSON MOTOR QOMPANY, 0F MILWAUKEEWISCONSINf' I COMBINEDINTAKE AND sxarausr Managerin] i f y v I i Y. 1,323,150. Speeica'iyf Letters Patent Patented Jan. 13, 1920.

Application inea Febrary 19, 191s.' seria1No.21s,o7a. l

To all whom t may concern.'

Be it'known that I, WILLILM' S. HARLEY, a citizenof the United States, and resident of Milwaukee, in the countyA of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Combined Intake and Exhaust Manifolds; 'and I do hereby declare that the following is, a`

full, clear, and exact description thereof;

' My invention consists in new and v,useful improvements in manifolds for internal combustion engines, particularlyv motorcycle engines of the type shown in my pending application Serial No. 192,116.

Heretofore it has been difficult to secure proper mixing of the gaseous fuel and air prior to the' combustion of the-same in engines having' opposed cylinders vsuch as illustrated in the above referred to patent application, this being' due to `the relativelyv great distance between the intake ports of the engine cylinders and the outlet of the carbureter. In other words owing to the fact that the carbureter is necessarily spaced a considerable distance froml the intake ports of the cylinders of such type of engine, the gaseous fuel is cold practically un-A til it enters lthe cylinders vand therefore proper mixing with the air cannot take place. It is necessary for the gaseous fuel to be e'xpanded-to-some extent before ,it can be properly mixed and this is only procurable by means of-heat radiated from the engine cylinders or by any other application of the same to the intakemanifold. Therefore, it is the principal object of the Apresent invention to provide an arrangement whereby the gaseous-fuel is heated and such heat continuously applied from the time the said fuel leaves the carbureter until it enters the intake ports of the engine cylinders.

It is another important object of my invention to combine the intake and ,exhaust Y manifolds in such amanner -that theI foreltion, and

grammatical View of a portion of a two cylinder internal combustion engine, said cylinders being `opposed and having a carbureter disposedthereadjacent, said carbu- ,reter and the opposed ends of the cylinders being connected with a vcombined, intake and exhaust manifold constructed in accordance with my invention, the portions of the. lat- Byreference to the drawings it will beseen that character A designatesfthe crank case of an internal combustion engine from theopposite, sides of which extend cylinders B, said cylinders being` opposed, and disposed adjacent vrand above one of said cylinders is a carbureter C of conventionaldesign. My improved intake and exhaust manifold D is arranged ywith respect to these parts so that the intake portion thereof connects the carbureter and the intake ports 1 of the cylinders, andthe exhaust portion thereof receives the spent gases from the exhaust ports 2. l'

In this type ofy engine the cylinders are disposedin a horizontal plane and the intake and exhaust orts thereof are therefore arranged vertical y, the intake port being directly above the exhaust port, the distance between the same being relativelyslight. This close proximity of the two ports of each cylinder is taken advantage of in casting my improvedcombined intake andl exhaust manifold in one iece.

Specifically this com ined manifold comprises an elongated horizontally disposed main casing 3 of a length approximately equal the distance between the ports in the opposite cylinders and of substantially rectangular shape in cross lsection. The ends of this casing 3. are closed by walls 4f, while adjacent each of these walls 4 and lformed through the inner side wall 5 is a pair of holes 6 and 7 respectively, these holes being vertically spaced and adapted toy aline with the ports 1 and 2 in each cylinder whensaid casing is arranged in juxtaposition to said cylinders asv shown in Fig. 1. Eachpair of openings is surrounded by a continuous flange 8 which seats against the material of the cvlinders surroundingv the ports 1 and4 2.

a vertical cross sectional view Y This. main @asin e is dividen .liuto a pair of longitudinal y extending elongated, pipe-like compartments 9 and 10 by a horizontally Iand longitudinally extending parttion wall 11 which extends from one. end wall 4 to the other and is formed integrally therewith as well as with the rear and front walls 5 .and 5 respectively. From Fig. 1 it will be seen that the material forming' the partition 11. adjacent each wall 4 is, enlarged and provided with a transversely extending aperture, these apertures being adapted to receive clamping olts 12 which extend through said material into the cylinders B to secure the manifold thereto.

- Access is `gained to the compartment 9 which connects with the intake ports 1 through an opening 13 formed in the top wall. of the' main chamber 3 intermediate the ends thereof, and this opening is connected With the outlet of the carbureter C through the compartment 14 of a two compartment supplemental casing 15, the u per end of which is detachably connecte to said carbureter while. the other end is formed integrally with the walls of the main chamber SThe compartments-'9 and 14 form the intake' manifold portion of my invention. Adjacent the opening 13 and opposite the same on the partition wall 11 is formed a deflector -16 for directing the incoming gas and air from the compartment 14v in .both directionsthrough the compartment 9 so that an equal amount of combustible mixture is distributed' to the cylin-f ders B. This deflector also aids in combinying the gaseous fuel and air and has a still further purpose which willV hereinafter be more particularly pointed out. l l

The other compartment 17 of the two compartment supplemental casing 1-5 has only one opening thereinto, this opening bes ing by way of a passage 18 from the compartment 10 of the main chamber 3. From- F ig. 2 it will be noted that this passage is substantially offset from the other parts of the com'binedmanifold, and that itis formed integrally therewith. i Y n From the compartment 10` an outlet pipe 19 vleads to the open air or to a muffler as desired, this outlet pipe being connected with the bottom of the main casing 3 intermediate the ends thereof, and preferably between one exhaust port 2 and the Vpassageway 18 as clearly shown in Fig. 1.

the` outlet pipe 19 for substantially the same purpose as the, delector- 16.

In the use of this combined manifold the same is connected to the engine cylinders A de- Hector. 20 is formed on the lower side of the 'partitlon wall 11 opposite the opening of Iand t0 the carbureter hC. The exhaust gases I' from theexhaust ports of the cylinders are forced into the compartment 10 of the main casing and are expelled therefrom through the outlet pipe 19. The ,heat of this exhaust gas warms the partitionlwall 11 to a relatively high degree andinasmuch as this wall forms one side of the compartment 9 through which the combustible mixture passes to the intake the same is heated and therefore the gaseous fuel and air is more thoroughlycomingled. The deiector 16. is quite hot and being extended into the compartment 9 4adjacent the inlet thereinto of the combustible mixture it will materially aid in heating su'ch mixture.

Although most heat -is imparted fuel while it is inthe compartment 9, yet nevertheless it is warmed to some extent while in the compartment 14 lof the supple-` mental casing 15, this being due to the fact t0 the that the compartment 17 is filled with hot spent gas by reason. of its being connected with the compartment 1() through the passage 18. The flow of fuel gas and also spent gases is shown by the arrows in Fig. 1.

With such an arrangement as this the combustible mixture will always be heated and thoroughly comingled before it reaches the 'intake ports of the engine cylinders even In a device of the class described, a coml bined exhaust and intake manifold com- -I prising a one piece cast elongated main casing, each' end of the casing having a pair of spaced openings, a longitudinally disposed wall extending from end to endof the casing between the openings to form a pair of pipe-like compartments each having a hole at each end, a laterally extending two compartment supplemental casing having its walls formed integrally with the wall of the first mentioned main casing, one end of one of the compartments of the laterally extending vcasing being in communication Awith one of the compartmentsof the main chamber, the other end of said compartment of the laterally extending casing being open,

a passageway from the other compartment of the laterally extend-ing casing toi the other compartment of the main casing, and an outlet from the last named compartment of the main casing.

In testimony that I claimythe foregoing I have hereunto set my hand at Milwaukee,

lin the county of Milwaukee, and State of Wisconsin.

WILLIAM s. HARLEY.. 

